Method and means for connecting windmills with electric generators



July 1 0, TQ Z SJ l ,6 7 7,02 3

L. CONSTANTIN METHOD AND MEANS FOR CONNECTING WINDMILLS WITH ELECTRIC GENERATORS Filed Feb. 5, 1925 VIIIIIIIIIIIIIIl/IIIIII'III Patented July 10, 1928.

UNITED STATES PATENT. OFFICE.

LOUIS CONSTAN'I'IN, F PARIS, FRANCE, A'SSIGNOR OF ONE-HALF T6 PAUL FORTIER- IBEAULIEU, OF ROANNE. FRANCE.

METHOD AND MEANS FOR CONNECTING WINDMILLS WITH ELECTRIC GENERATORS.

Application filed February 5, 1925, Serial No. 7,128, and in France February 12, 1924.

My invention relates to electrical apparatus for dynamo-electrical machines driven by a prime mover having wide variationsin power-output such as a windmill and the object of the invention is to so arrange said apparatus as to compensate for the rapid variations in speed to which the generator is subjected.

In order to understand'the principle upon which my invention is based, suppose that a generator driven in the manner indicated a be connected in circuit with a constant resistance 1' and a variable resistance It, all in series. Assume that the voltage across the enerator is E, then the power consumed by 5X6 two resistances (W) will be:

The ratio of the amount of power of resistance 1' to resistance R thus absorbed individually will obviously be:

Let us suppose that tlie'voltage at "theterminals of the generator is suddenly increased due to an increase in s eed of the prime mover and that it has now ecome a E, where or is greater than unity, and that the variable resistance has becnincreased to B Itwhere p is greater than unity, the power (IV) consumed under these conditions is readily determined by substituting in formula 1, from which is obtained:

. aE I= W r+BR (3) The ratio of the power absorbed by'one resistance with respect to the other under these conditions is obtained from formula 2, or v a independently of the fixed resistance 1'. Let the intensity. of the current (I) be desired to be constant, then the total power consu'ined by the resistances will be (1 (1"+ ,BR)) and combining formula (3) we obtain:

12 (TBR) 5) I In order to obtainthe power consumed by the fixed resistance r it is first necessary to solve equation for the value of the current (I) assumed to be constant which gives:

aE een The power W is readily obtained then as follows: E

'2 W, Ir 036+)? (8) It will thus be seen that the power in equation (8); will be independent of a and equal to 1 1" provided a suitable relation is maintained between or and B so that under these conditions the resistance 1- will be traversed by a current of constant intensity.

The variable resistance will thus-act as a plugging resistance the value of which is determined by regulating ,8 as a function of a. In actual practice the resistance 1' 1s replaced by a working circuit and translating devices which cannot ordinarily support but a limited overload. The value of the variable resistance may thus be regulated to conform to the best working conditions in the manner above described. I

The single figure of the accompanying drawin shows, byway of example, a diagrammatic View ofhow the above outlined principles of my invention may be put into practice.

A generator G, which is excited for instance by the battery B, supplies current to &' workc'ircuit represented in the drawing as comprising the motor M, and also to an electric boiler whereof one electrode L is movable. To this end the electrode L. is carried by a circular rack E engaged by a gear wheel A which in turn is operated by a rack F retracted by. a spring D. The rack F is connected to the core N of the re ulat- 4 ing device V. The motor M and the oilei C are connected in series. The electrode L is adjusted by the automatioregulating device V which operates according to the voltage variations at the terminals of the gen-, erator in such manner that each increase in voltage will correspond to an additional spacing of the electrodes of the said boiler. Obviously many variations may be made i in my invention without departing from the scope thereof, such as the number of generators, the number and character of transnamo-electric machines comprising in combination with a generator subjected to rapid variationsin speed, a translating device, an electric boiler, a movable and a fixed electrode in said boiler, means for serially connecting said translating device, said generator and the electrodes of said boiler, means for varying the resistance of said boiler by changing the position of said movable electrode and automatic means for varying said last mentioned means in accordance with the voltage supplied by said generator for the purpose disclosed.

2. A voltage regulating system for dynamo-electric machines comprising in combination with a generator subjected to rapid variations in speed, a translating device, an electric boiler, a movable and a fixedelem trode in said boiler, means for serially connecting said translating device, said generator andthe electrodes of said" boiler, a rack on said movable electrode, a pinion meshing with said rack, a solenoid, a plunger for said solenoid, a. rack on said plunger meshing with said pinion and means for connecting said solenoid in parallel with said boiler and said translating device for the purpose disclosed.

In testimony specification.

whereof I have signed this Lou s CONSTANTIN; 

